A nurse is reinforcing teaching with a client who is starting digoxin therapy to treat heart failure. The nurse should reinforce with the client that which of the following adverse effects is a possible indication of digoxin toxicity and should be reported to the provider?

Choice A Reason: Digoxin can produce alterations in the visual system of patients, such as reduced visual acuity, photophobia, and blurred or yellow vision. Choice B Reason: While tinnitus can occur with various medications, it's not a specific symptom of digoxin toxicity. Choice C Reason: Joint pain is incorrect. Joint pain is not a common symptom of digoxin toxicity. Choice D Reason: Constipation is incorrect. Constipation is not typically associated with digoxin toxicity either.